I was thinking about something last night. Concerned black holes and branes, Lets imagine a brane from another universe forms a black hole and connects to our universe. The ejecta would be nothing like we have seen since all particles have passed thru a singularity, and have been stripped of any resemblance of their former selves (ie everything we know about particles are ripped apart). I would speculate at those energies, even quarks would be broken down. They arrive into our universe bare. Could this be the dark matter we think exists? I guess the essential question is does a black hole rip thru the fabric between universes/branes.